Dynamometer.



J. A. RANDALL.

DYNAMOMETER.

APPLICATION FILED APR. 25 1913.

:1.911, jlo .Patented Apr. 6, 1915.

3 SHEETS-SHEET 1.

J. A. RANDALL DYNAMOMETER.

APPucATloN FILED APn.25, 1913,.

Patented Apre 6, 1915.

MM a

7725 www l. A. RANDALL.

DYNAMOMETER. APPLICATION FIL`ED APR. 25. 1913.

p@ Patented Apr. 6, 1915.

8 SHEETS-SHEET 3.

WIM/5355 Q. @Md /NVENTOR UNITED .STATES PA Y JOHN' A. ALL, 0F BROOKLYN,NEW YORK.

DYNAMOME Specication of Letters Patent. y

Patented Apr'. f6, 21915..

' Application 1811 April 25, 1913. Serial No. 763,574.

To all whm 'it may concern Be it known that l, JON A. RANDALL, a

'Citizen of the United states, residing at 215 Y and adaptation of theparts as Will be more 9 9 in Fig. 8; Fig. 10 is an edge view of the Yfully hereinafter pointed out.

The object of the inventioniis -to provide a simple and efficient meansfor readily indieating -the amount .of power transmitted through amechanism or the amount of energyconsumed in actuating a mechanism.

In the drawings, Figure 1 is a central longitudinal section Kand partialside elevation of a form of device embodying my invention; Fig. 2 is asection on the plane of the line 2 2 in Fig. 1; Fig. 3 is a section onthe plane of the line 3 3 in Fig.l1; Fig. 4f is a view similar to Fig.1, showing the jaws closed, some of the parts shown in Fig. 1 beingomitted; Fig'. 5 is a viewvsimilar to Fig'.-

3, `showing the transmitting springs distended; Figs. 6 and 7 aredetalls showing the sliding contactors in different positions; Fig, 8 isan enlarged view of the clutch spider; Fig. 9 is a section 'on the planeof the line parts shown in Fig. 8; Fig. 11 is an enlarged side elevationof the stud bracket mounted on the clutch disk, and 12 is a frontAelevation thereof. A Y

ln the drawings 10 is a driving shaft supported in suitable bearings(not shown) and driven from any suitable source ofpower indicated at 11;12 is a clutch ring securedto the shaft 10 by suitable means indicatedat 13 and having an annular'iiange 14.

20 is a driven shaft, supported in suitable i bearings (not shown).Secured to this shaft is a spider 21 having a pluralitgy7 of radial arms22, each of which has near its extremity a stud 23 adapted to serve as asupport` comprising a number of plates 26 made of for one end 'of aspring 24.

Loosely mounted on the shaft 20 isa hub 30 carrying a disk 31, providednear its periphery with a number of studs. 32, each mountedl on abracket 33 secured to the disk 31 by bolts 34 or other suitable means.These studs 32 serve each as a supportfor one end of each spring 24 andare caused to project toward the clutch ring in order that these springsshall clear the arms 22 of the.

spider 21. Y On the disk 31 at suitable intervals are ,centrally pivoteda series of roch'ng arms 35 to each of which are pivotaily secured apairof jaws 36 and 37, adapted to embrace the iiange 14 of the clutch 12and the Shanks 38 of which jaws are each slidabiy 'mounted in slidewaysupon the disk 31 and adapted to be moved radialy thereon. Each rockingarm 1s provided with a wedge mem- Ber 350 adapted to be adjusted by aboit indicated at 351. Pivoted on the disk 31 near each rocking arm 35is a cam lever 39, one

edge vof which is adapted to engage 'the- Inanently pivoted a shifterarm 51 (see Fig.

2) .i On the yoke 50 at any convenient plac and mounted on bases 520iinsuiating material are' two brushes indicated at 53 53. Secured to theshifter barrel are a pluraiity of slip rings 54, 55, one of which isadapted to 'ccperate with each brush.

A Mounted near the end of the 26 is a gear adapted to mesh with anddrive a pinion 6l off a magneto indicated at 62. Power connection fromthe end lof the shaft 20 to the machines to be actuated therefrom areindicated by la belt 63 leading to apuliey (not shown).

The' magneto may be driven from the shaft 10 or even independentiy ofvthe described mechanism ifdesired, or' any other 'suitable source orelectrical energy may he employed.

Onone of the arms 22 of .the spider 21 is mounted a' rheostat indicatedat 25, and

conducting material with .plates of insulating material 27 between them.A slideway indicated at 28 is arranged adjacent to these plates andslidably mounted thereon is n movableY contacter indicated Yat 29.contacter is secured at one end'of a' heli ien crank lever 290 pivotedon the bracket 33 by the bolt 34, and the other end of which is pivotedto a link 291 secured to the stud 23 of the arm 22 on which the rheostatis mounted.

An electrical circuit is provided by suitable conductors as follows: Aconductor a leads from the plus side of the magf neto 62 to the brush 53of the slip ring 55, a second conductor Z) leads from this slip ring toone end of the rheostat 25; a third conductor c leads from the other endof the rheostat to the slip ring 54, and a fourth conductor d leads fromthe brush 53 of this slip ring to the minus side of the magneto 62. v

A voltmeter 70 of any suitable construction is placed conveniently nearvthe device as above described, and its dial is either graduated asusual to show the voltage or is specially graduated to indicate horsepowers or some other convenient functional notation of the voltage.

A conductor m leads from the shaft 10 to one side of the voltmeter and asecond conductor n joins the other side of the voltmeter to theconductor d.

When the machine is to be used, the driven shaft 20 is first connectedto the mechanism to be tested. The shifter 40 is then moved toward theleft (as seen in Fig. 4) by means of thel shifter arm 51. This moves thetogglelinks 390, and the cam le fers 39, and the latter engaging thewedges 350 of the rocking arms 35 moves these arms caus ing them toactuate the pairs of jaws 36 and 37, which grip the annular flange 14 ofthe clutch ring 12. i i v The clutch ring 12 being keyed to the shaft 10moves 1with it, and motion is thus imparted through the jaws 36 and 37to the disk 31 and consequently to the studs 32, and the draft springs24 each secured at one end to one of these studs are stretched until thestuds 23 of the spider and consequently the spider itself is moved andmotion is thus imparted to the driven shaft- 20. As'the spider 21 isthus circularly moved\ with respect to the disk 31, the bell crank lever290 is moved and the sliding contactor 29 is moved along the slideway 28of the rheostat 25. f

As a constant current passes normally through the electrical system,when the sliding contactor 29 stops at any one of the conducting plates26 o-f the rheostat it grounds that plate. This allows a very smallfractional part ofthe total current traveling from the magneto to escapetothe spider 21 and shaft 10 and thence to pass through the voltmeterand return to the magneto through the conductors u and d.

The parts are so arranged that the terminals of the'conductors fm. and cat the rheostat are electrically lthe same when the clutch has not beenactuated. I -As the voltmeter terminals are in such case between v Ynegligible small reading or zero.` But when the clutch is actuated andthe power is transmitted from the driving shaft 10 to the driven shaft20 through the spider21 and disk 31, and the springs are stretched and4that-arm 22 of the spider to which thelink 291 is pivoted is moved; thenit is evident that the extent of this movement and consequently of thesliding contactor 29 of the rheostat 25 is a function of the powertrans# mitted from one. shaft to the other and a measure of suchpowerwhen the speed is constant. Vhen, however, the sliding contactormoves it grounds a plate 26 other than the one with which it contactedbef fore such movement and there will then be a greater resistancebetween the terminals where the conductors m and n are connected to thevoltmeter, and the voltmeter indicator will move to a reading which willindicate the amount of such resistance and consequently the amount oflpower transmitted.

By the use of a magneto suitable to sup. ply a current proportional tothe speed Within the range'of variation required in any given sense thevoltage between any two contact points may be made to vary in directproportion to the speed. `And since the sliding contactor is moved overa number of points in proportion to the torque and the voltage betweensuch points varies as the speed, the voltmeter reading will vary as theproduct of the torque and speed or the power. Therefore, by using aproperly graduated scale in the voltmeter this instrument will indicatedirectly the power transmitted. p v

What I claim as new is:

1. In combination a driving shaft, a driven shaft, a spider secured tothe driven `shaft, a disk loosely mounted on thesame shaft, a clutchconnecting the disk to the driving shaft, a spring connecting the disk.and the spider, a contactor, a lever actuated from the spider to movethe contactor, a rheostat over which the contactor is adapted to moveand a source of electrical energy in circuit with the rheostat.

2. In combination, a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same 15 shaft, a clutchconnecting the disk to the 4. ln combination a driving shaft, a.

driven shaft, a spider secured to the driven shaft,. a disk looselymounted on thesame shaft, a clutch connecting the disk t the drivingshaft, a spring connecting the disk and the spider, a contactor, a leveractuated from the spider to move the contactor, a`

rheostat over which the contactor is adapted to move and a source ofelectrical energy in circuit with the rheostat, and means forindicating' the variations in the resistance in the rheostat due to themovement of the contactor, including a voltmeter graduated in terms ofthe power transmitted between the driving and the driven shafts. Y

5. In combination a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting` the disk to the driving shaft, a shifter for operating theclutch, a spring connecting the disk and the spider, a contactor, alever actuatedfrom the spider to move the contactor, .a rheostat overwhich the contactor is adapted to move and va source of "electricalenergy in circuit with the rheostat.

6. ln 'combination a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the d isk to the driving shaft, a shifter for operating theclutch, a spring connecting the disk and the spider, a contactor, alever actuated from the spider to move the contactor, a rheostat overwhich the contactor is adapted to move and a source of electrical energyin circuit with the rheostat` und-means for indicating the variations inthe resistance in the rheostat due to the movement of the contactor.

7.\In combination a I driving shaft, a

driven shaft, a spider secured to the driven shaft, a disk looselymounted on the samev shaft, a clutch connecting the disk to the drivingshaft, a shifter for operating the clutch, a spring connecting the diskand the spider, a contactor, a lever' actuated from the spider to movethe contactor, a rheostat over which the contactor is adapted to moveand a-source of electrical energy in `circuit with the rheostat, andmeans for indicating the variations in the resistance in the rheostatdue to the movement of the contactor, including a voltmeter..

8. In combination a driving shaft, a

driven shaft, a spider secured to the driven shaft, a disk `looselymounted on the same shaft, a clutch connecting the disk to the drivingshaft, a shifter for operating the clutch, a spring connecting thedisk'and the spider, a contactor, a lever actuated from the spider tomove the contactor, a rheostat over which the contactor is adapted tomove and a source of electrical energy in circuit with the rheostat, andmeans for indicating the variations in the resistance in the rheostatdue to the movement of the contactor, including a voltmeter graduated interms of the ower transmitted between the driving an the driven shafts.

9. in combination a driving shaft, a I' driven shaft, a spider securedto the driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the driving shaft, a shifter loosely mounted onthe driven shaft and provided with a brush and two slip rings each incontact with the brush, a rheostat, a source of electrical energy incircuit with the slip rings and-the rheostat,' a spring between the diskand the spider, a lever actuated from thefspider, and a slidingconductor moved by the lever in proportion to the stretch of the springalong the rheostat.

10. In combination -a driving shaft, a

driven shaft, a spider secured to the driven shaft, a .disk looselymounted on the same shaft, a clutch connecting the disk to the Vdrivingshaft, a shifter loosely mounted on the driven shaft and provided with abrush and two slip rings leach in contact'with the brush, a rheostat, asource of electrical energy in circuit with the slip rings and therheostat, a Aspring betweenthe disk and the spider, a lever actuatedvfrom the spider, and a sliding conductor moved by the lever Yinproportion to the stretch ofthe spring along the rheostat, and avoltmeter also in circuit -With the rheostat and adapted to measure theextent of the variation ofthe resistance" therein dueto the movement ofsuch sliding conductor.

11. In combination, a driven shaft, a drive shaft, a spider secured tothe shaft, a

disk looselyf mounted on the hub of the` spider, a clutch connecting thedisk to the driving shaft, a shifter loosely mounted on the driven shaftand provided with a brush und two slip rings each in contact with thebrush, a rheostat, a source of electrical energy 'in circuit with theslip rings and the rheostat, a spring betweenl the disk and the spider,a lever actuated from the spider, and a sliding conductor moved by thelever in proportion to the stretch of the spring along the rheostat, anda voltme'ter also 1n circuit with the rheostat and adapted to measureloo indicating the variations in the resistance in the voltmetercircuit. due to the movement of the contactor.

13. In combination, a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the driving shaft, a spring connecting the diskand the spider, a contactor, a lever actuated from the spider to movethe contactor, a

' rheostat over which the contactor is adapted to move' and a source ofelectrical energy in circuit with the rheostat, and means for 1ndicatingthe variations in the resistance in the voltmeter circuit due to themovement of the contactor, including a voltmeter.

14:. In combination, a driving shaft, a driven shaft, a spider securedto the driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the/disk to the driving shaft, a spring connecting the diskand the spider, a contactor, a lever actuated from the spider to movethe contactor, a rheostat over Which the contactor is adapted to moveand a source of electrical energy in circuit with the rheostat, andmeans for indicating the variations in the resistance in the voltmetercircuit due to the movement of the contactor, including a voltmetergraduated in terms of the power transmitted between the driving and thedriven shafts.

15. In combination, a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disklooselyv mounted on the same shaft, a clutchconnecting the disk ,t0 the driving shaft, a shifter for operating theclutch, a spring connecting the disk and the spider, a contactor, alever actuated from the 'spider to move the contactor, a rheostat overwhich the contactor isadap'ted to move and a source of electrical energyin circuit with the rheostat, and means for indicating the variations inthe' resistance in the voltclutch, a spring connecting the disk and thespider, a contactor, a liever actuated from the spider to move thecontactor, a rheostat over which the contactor is adapted to move and asource of electrical energy in circuit With the rheostat, and means forindicating the variations in the resistance in the voltmeter circuit duetothe movement of the contactor, including a voltmeter.

17 In combination, a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the driving shaft, a shifter for operating theclutch, a spring connecting the disk and the spider, a contactor, alever actuated from the spider to move the contactor, a rheostat overwhich the contactor is adapted to move and a source of electrical energyin circuit with the rheostat, and means for indicating the variations inthe resistance in the voltmeter vcircuit due to the movement of thecontactor, including a voltmeter graduated in terms of the powertransmitted between the driving and the driven shafts.

18. In combination, a driving shaft, a

driven shaft, a spider secured to the driven shaft, a disk looselymounted on the same shaft, a clutch connecting the disk to the ydrivingshaft, a shifter vloosely mounted on the driven shaft andprovided with two-slip rings a brush n the' shifter in contact with saidrings, a rheostat, a source of electrical energy. in circuit with theslip rings and the rheostat, a spring between the disk and the spider,and a slidingconductor moved'in proportion to the stretch of the springalong the rheostat, and a voltmeter also in circuit with the rheostatand adapted to measure the extent of the variation of the resistance inthe voltmeter circuit due to the movement of such sliding conductor.

19. In combination, a .driving shaft, a driven shaft, a spider securedtothe driven shaft, a disk looselymounted on the same` shaft, a clutchconnecting the disk to the driving shaft, la spring connecting the diskand the spider, a contactor a lever actuated from the spider to move thecontactor, a

rheostat over which the contactor is .adapt-A -ed to move, and meansconnected with the driven shaft for producing an electro-motive force inproportion to the speed of the latter, and means for indicating thevariat1ons 'in thei'resistan'ce in the rheostat due to the movement ofthe contactor.

20. In combination, a driving shaft, a-

driven shaft, a spidgr secured to 'the driven shaft, a disk looselymounted on the same shaft, a clutch connecting the disk to the drivingshaft, a contactor, a spring connecting the disk and the spider, a leveractuated from the spider to move the contactor, a

rheostat over which the contactor is adapted to move, andI meansconnected with the driven shaft for producing an electro-.mo-

tive force in proportion to the speed of the latter, and means forindicating the variato move and means connected with thel driven shaftfor producing an electro-motive force in proportion to the speed of thelatter, and means for indicating the variations in the resistance in therheostat due to the movement of the contactor, including a voltmetergraduated in terms of the power transmitted between the driving and thedriven shafts.

22,'. In combination a driving shaft, a driven shaft, a. spider securedto the driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the driving shaft, a shifter for operating theclutch, a spring connecting the disk and the spider, ,a contactor, alever actuated from the spider to move the contactor,.'a rheostat overwhich the contactor is adapted to move and means connected with thedriven shaft for producing an electro-motive force in proportion to thespeed of the latter.

23.` In combination, a driving shaft, a driven shaft, a spider securedto the driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the drivingshaft, a shifter for operating theclutch, a spring connecting the disk and the Spider, a contactor, alever actuated from the spider to move the contactor, a rheostat overwhich the contactor is adapted to move, and means connected with thedriven shaft for producing an electro-motive force in proportion to thespeed of the latter, and means for indicating the variations in theresistance in the rheostat due to the movement of the contactor. i 24.In combination, a driving shaft, a driven shaft, a spider secured tothedriven shaft, a' disk loosely mounted on the same shaft, a clutchconnecting the disk to the driving shaft, a shifter f r operating theclutch, a spring connecting t e disk and the spider, a contactor, alever actuated from the spider to move the contactor, a rheostat overwhich the contactor is adapted to move, and means connected with thedriven shaft for producing electro-motive force in proportion to thespeed of the latter, and means for indi` cating the variations in theresistance in the rheostat due to the movement of the con-l tactor,including a voltmeter.

25. In combination, a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the driving shaft, a shifter for operating theclutch, a spring connecting the disk and the spider, a contactor, alever actuated from the spider to move the contactor, a rheostat overwhich the contactor is adapted to move, and means -connected with thedriven shaft for producing an electro motive force in proportion to thespeed of the latter, and means for indicating the variations in theresistance in the rheostat due to the move? ment of the contactor,including a voltmeter graduated in terms of the power transmittedbetween the driving and the driven shafts.

26. In combination a driving shaft, a.

driven shaft, a spider secured to the driven shaft, a disk looselymounted on the same shaft, a clutch connecting the disk to the drivingshaft, a shifter loosely mounted on the driven shaft and provided with abrush and two slip rings each in contact with the brush, a rheostat,means connected with the driven shaft for producing an electro-motiveforce in proportion to the speed of the latter, a spring between thedisk and the spider, and a sliding conductor moved in'proportion to thestretch of the spring along the rheostat.

27. In combination a driving shaft, a driven shaft, a spider secured tothe driven shaft, a disk loosely mounted on the same shaft, a clutchconnecting the disk to the drivin shaft, a shifter loosely mounted onthe driven shaft and provided with two slip rings, brushes on theshifter in contact with the sli rings, a rheostat; means connected witht e driven shaft for producing an electro-motive force in proportion tothe speed of the latter, a spring between the disk and the spider, and asliding conductor moved in proportion to the stretch of the.

spring along the rheostat, and a voltmeter also in circuit with therheostat and adapted to measure the extent of the variation of theresistance therein due to the movement of such sliding conductor. y

In testimony whereof I aiiix my slgnature in presence of two witnesses.

JOHN A. RANDALL..

Witnesses CLARENCE Gr. CAMPBELL, MARY H. LEWIS.

